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Abstract
Multi-angular narrowband compact high-resolution imaging spectrometer (CHRIS) on-board the project for on-board autonomy (PROBA) data of 18 March 2008 were used in this study to discriminate three different growth stages of wheat crop grown in the Central State Farm of Suratgarh, Rajasthan, India. Results showed that the off-nadir view angles performed better than nadir viewing for crop stage discrimination. Among all the off-nadir viewing angles, −55.37° view angle (in the backward-scattering direction) had the highest normalized distance between the crop stage classes. Based on the analysis, the five best bands were identified as 630, 660, 674, 705 and 712 nm for separating wheat at different stages.
Acknowledgements
This study was carried out as part of CHRIS/PROBA AO Project (ID 5091). The CHRIS data provided by ESA for this study is thankfully acknowledged. The authors are grateful to Dr. J.S. Parihar, Deputy Director, SAC, and Dr. R.R. Navalgund, Director, SAC, for their keen interest and encouragement. Thanks are due to Sh. K.R. Manjunath and Dr. Sujay Dutta of SAC and the scientists and staff of CSF, Suratgarh, for their help during field observations. Authors thank Dr. V.N. Sridhar for critical evaluation of the manuscript.